Sprites staying after moving down

Question

I am trying to make blocks fall to fall to the ground, but sadly the old sprites won't disappear. I have tried to move sprites with .move_ip, but then I get an error message, saying that my rect doesn't have attribute 'move_ip'. Also a little bit non-related, but how do I make the blocks stack on top of eachother? I suppose it's something to do with worldy?

import pygame
import random

pygame.init()
WHITE = (255, 255, 255)
worldx = 590
worldy = 770
screen = pygame.display.set_mode([worldx, worldy])
screen.fill([0,0,0])
gravity = 1
class Block1(pygame.sprite.Sprite):
    def __init__(self,x,y):
        super().__init__()
        self.image = pygame.image.load("img_12.png")
        self.rect = self.image.get_rect(topleft = (x,y))
        self.x = x
        self.y = y
        self.speed_y = 0
        
    def update(self):   
        self.speed_y += gravity
        self.y += self.speed_y
        self.rect.y = self.y
        if self.rect.y >= worldy:
            self.speed_y = 0

    
        
x = 0
y = 1
dt = 0
timer = 1
all_sprites_list = pygame.sprite.Group()
stopped_blocks = pygame.sprite.Group()
clock = pygame.time.Clock()

score = 0
block = Block1

mäng_töötab = True
while mäng_töötab:
    
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            mäng_töötab = False
     
    timer -= dt
    if timer <= 0:
        x = random.randrange(0, 18) * 32
        all_sprites_list.add(block(x,y))
        timer = 1
    all_sprites_list.draw(screen)
    all_sprites_list.update()        
    pygame.display.flip()
    dt = clock.tick(60) / 1000
    
pygame.quit()

Not sure, because then my blocks would disappear, but I want that after landing my blocks would stay where they landed. — rind, Dec 22 '21 at 02:25
Every game loop you should draw the background, then your blocks, then your sprites. You can try an do a fill in the old position of the sprites, but that's too much hassle. — import random, Dec 22 '21 at 02:44

score 0 · Answer 1 · answered Dec 22 '21 at 06:01

You have to clear the display in every frame:

while mäng_töötab:
    
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            mäng_töötab = False
     
    timer -= dt
    if timer <= 0:
        x = random.randrange(0, 18) * 32
        all_sprites_list.add(block(x,y))
        timer = 1

    screen.fill(0)                           # <---    

    all_sprites_list.draw(screen)
    all_sprites_list.update()        
    pygame.display.flip()
    dt = clock.tick(60) / 1000

The typical PyGame application loop has to:

limit the frames per second to limit CPU usage with pygame.time.Clock.tick
handle the events by calling either pygame.event.pump() or pygame.event.get().
update the game states and positions of objects dependent on the input events and time (respectively frames)
clear the entire display or draw the background
draw the entire scene (blit all the objects)
update the display by calling either pygame.display.update() or pygame.display.flip()

Sprites staying after moving down

1 Answers1